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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2021.1817 USN-4967-1: nginx vulnerability 27 May 2021 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: nginx Publisher: Ubuntu Operating System: Ubuntu Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated Denial of Service -- Remote/Unauthenticated Access Confidential Data -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2021-23017 Reference: ESB-2021.1802 Original Bulletin: https://ubuntu.com/security/notices/USN-4967-1 - --------------------------BEGIN INCLUDED TEXT-------------------- USN-4967-1: nginx vulnerability 26 May 2021 nginx could be made to crash or run programs if it received specially crafted network traffic. Releases o Ubuntu 21.04 o Ubuntu 20.10 o Ubuntu 20.04 LTS o Ubuntu 18.04 LTS Packages o nginx - small, powerful, scalable web/proxy server Details Luis Merino, Markus Vervier, and Eric Sesterhenn discovered that nginx incorrectly handled responses to the DNS resolver. A remote attacker could use this issue to cause nginx to crash, resulting in a denial of service, or possibly execute arbitrary code. Update instructions The problem can be corrected by updating your system to the following package versions: Ubuntu 21.04 o nginx-extras - 1.18.0-6ubuntu8.2 o nginx-core - 1.18.0-6ubuntu8.2 o nginx-common - 1.18.0-6ubuntu8.2 o nginx-full - 1.18.0-6ubuntu8.2 o nginx - 1.18.0-6ubuntu8.2 o nginx-light - 1.18.0-6ubuntu8.2 Ubuntu 20.10 o nginx-extras - 1.18.0-6ubuntu2.2 o nginx-core - 1.18.0-6ubuntu2.2 o nginx-common - 1.18.0-6ubuntu2.2 o nginx-full - 1.18.0-6ubuntu2.2 o nginx - 1.18.0-6ubuntu2.2 o nginx-light - 1.18.0-6ubuntu2.2 Ubuntu 20.04 o nginx-extras - 1.18.0-0ubuntu1.2 o nginx-core - 1.18.0-0ubuntu1.2 o nginx-common - 1.18.0-0ubuntu1.2 o nginx-full - 1.18.0-0ubuntu1.2 o nginx - 1.18.0-0ubuntu1.2 o nginx-light - 1.18.0-0ubuntu1.2 Ubuntu 18.04 o nginx-extras - 1.14.0-0ubuntu1.9 o nginx-core - 1.14.0-0ubuntu1.9 o nginx-common - 1.14.0-0ubuntu1.9 o nginx-full - 1.14.0-0ubuntu1.9 o nginx - 1.14.0-0ubuntu1.9 o nginx-light - 1.14.0-0ubuntu1.9 In general, a standard system update will make all the necessary changes. References o CVE-2021-23017 - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. The decision to follow or act on information or advice contained in this security bulletin is the responsibility of each user or organisation, and should be considered in accordance with your organisation's site policies and procedures. 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Previous advisories and external security bulletins can be retrieved from: https://www.auscert.org.au/bulletins/ =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane Qld 4072 Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBYK8DyuNLKJtyKPYoAQjTcA//frZx/ImLFC43MFQEI2IAvMyTsRU/Ayey ZDIUh7WUiYxM0WCeR/uLPjcXs8Z+us5JEjjAh8hAzRR3jq/kJBjEHahOzkK4w+Eh yUzvFz4j2ZRelVBxqYlniAFvtCR3949pvhgvPWR20r/8PYhvn8Z3i9ceFDaAHVjx A1x4PGb9KE67qh0B91lGHyVblfRR9UY4Fmp1Aht9rQQJkoXb79V3tCeyMJ1fc098 +Mm7EoGqPezz+sWtl3q7iADUnkt2bNQ+AOSbsexvVoPedmEgSVSN0xkABB1W4STc 4VjoOtvBmqsKCwMtRFEVLvAWohhWqHafQUogvjtmEzh0Kn7w8yebV2fvJJ3O/fB7 GezGNndo78cRvFsXIbpgzpaPSng2BkYBlN88KusXVMEMLlEBoyBxuNpU6S+hPnWa nzJ1qWNR/mmqmcgo6v1ULsXlyrzBISXT/WnhSZzxt6M/5gx+FKIZ8Q6oAcK9GJ4J QSfsALEokOGEm+gHEODa7hideW/520o9JKmqRv2sF07zimMQgCqkP7tj6uaDuDk2 /N2d17xBzPiSf2kAYXHJFYmsvyGIRC6ZfWX1BZ836lbCYxV4uReFkhil7F8rqXNL Qyxw5i6pk6yYM/e8gNOmypActUYIb2E1rP57f1/CTRrBK6OlaWguMbS/WpiMmpST O9RZASlPr8U= =D7EJ -----END PGP SIGNATURE-----